package com.imooc.service.impl;

import com.imooc.converter.OrderMaster2OrderDTOConverter;
import com.imooc.dataobject.OrderDetail;
import com.imooc.dataobject.OrderMaster;
import com.imooc.dataobject.ProductInfo;
import com.imooc.dto.CartDTO;
import com.imooc.dto.OrderDTO;
import com.imooc.enums.OrderStatusEnum;
import com.imooc.enums.PayStatusEnum;
import com.imooc.enums.ResultEnum;
import com.imooc.exception.SellException;
import com.imooc.repository.OrderDetailRepository;
import com.imooc.repository.OrderMasterRepository;
import com.imooc.repository.ProductInfoRepository;
import com.imooc.service.OrderService;
import com.imooc.service.ProductService;
import com.imooc.utils.KeyUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Created by Administrator on 2019/3/29.
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMasterRepository orderMasterRepository;

    @Autowired
    private OrderDetailRepository orderDetailRepository;

    @Autowired
    private ProductInfoRepository productInfoRepository;

    @Autowired
    private ProductService productService;

    //卖家查询所有订单
    @Override
    public Page<OrderDTO> findList(Pageable pageable) {

        Page<OrderMaster> orderMasterPage = orderMasterRepository.findAll(pageable);
        //getContent()从page中获取对象
        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());

        return new PageImpl(orderDTOList, pageable, orderMasterPage.getTotalElements());
    }

    //根据openid查询买家订单
    @Override
    public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) {

        Page<OrderMaster> orderMasterPage = orderMasterRepository.findByBuyerOpenid(buyerOpenid, pageable);

        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());


        PageImpl<OrderDTO> orderDTOPage = new PageImpl<OrderDTO>(orderDTOList,pageable,orderMasterPage.getTotalElements());
        return orderDTOPage;
    }

    //创建订单
    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {

        String orderId = KeyUtil.genUniqueKey();
        //1.查询商品(数量,价格)
        List<String> productIdList = orderDTO.getOrderDetailList().stream()
                .map(OrderDetail::getProductId)
                .collect(Collectors.toList());
        List<ProductInfo> productInfoList = productInfoRepository.findByProductIdIn(productIdList);

        //2.计算总价
        BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO);
        for (OrderDetail orderDetail : orderDTO.getOrderDetailList()) {
            for (ProductInfo productInfo : productInfoList) {
                if (orderDetail.getProductId().equals(productInfo.getProductId())) {
                    orderAmount = productInfo.getProductPrice()
                            .multiply(new BigDecimal(orderDetail.getProductQuantity()))
                            .add(orderAmount);
                    BeanUtils.copyProperties(productInfo,orderDetail);
                    orderDetail.setOrderId(orderId);
                    orderDetail.setDetailId(KeyUtil.genUniqueKey());
                    //订单详情入库
                    orderDetailRepository.save(orderDetail);
                }


            }
        }

        //4.扣库存
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream()
                .map(e -> new CartDTO(e.getProductId(), e.getProductQuantity()))
                .collect(Collectors.toList());

        productService.decreaseStock(cartDTOList);

        //订单入库
        OrderMaster orderMaster = new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO,orderMaster);

        orderMaster.setOrderAmount(orderAmount);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());

        orderMasterRepository.save(orderMaster);

        return orderDTO;
    }

    @Override
    public OrderDTO findOne(String orderId) {
        OrderMaster orderMaster = orderMasterRepository.findOne(orderId);
        if (orderMaster == null ) {
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }
        List<OrderDetail> orderDetailList = orderDetailRepository.findByOrderId(orderId);
        if (CollectionUtils.isEmpty(orderDetailList) ) {
            throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST);
        }
        OrderDTO orderDTO = new OrderDTO();
        BeanUtils.copyProperties(orderMaster,orderDTO);
        orderDTO.setOrderDetailList(orderDetailList);

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO cancel(OrderDTO orderDTO) {

        OrderMaster orderMaster = new OrderMaster();

        //判断状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("[取消订单]订单状态不正确,orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if (updateResult == null) {
            log.error("[取消订单]更新失败,orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        //返还库存
        if (CollectionUtils.isEmpty(orderDTO.getOrderDetailList())) {
            log.error("[取消订单]订单详情为空,orderDto={}",orderDTO);
            throw new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
        }
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream()
                .map(e -> new CartDTO(e.getProductId(), e.getProductQuantity()))
                .collect(Collectors.toList());
        productService.increaseStock(cartDTOList);
        //如果已经支付,退款
        if (orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS)) {
            //TODO
        }
        return orderDTO;
    }


    @Override
    @Transactional
    public OrderDTO finish(OrderDTO orderDTO) {

        //判断状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("[完结订单]订单状态不正确,orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);

        if (updateResult == null) {
            log.error("[完结订单]更新失败,orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("[订单支付]订单状态不正确,orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }
        //判断支付状态
        if (!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode())) {
            log.error("[订单支付]订单支付状态不正确,orderId={},PayStatus={}",orderDTO.getOrderId(),orderDTO.getPayStatus());
            throw new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }
        //修改支付状态
        orderDTO.setPayStatus(PayStatusEnum.SUCCESS.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);

        if (updateResult == null) {
            log.error("[订单支付]更新失败,orderMaster={}",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        return orderDTO;
    }
}
